6442604381 has 2 divisors, whose sum is σ = 6442604382. Its totient is φ = 6442604380.

The previous prime is 6442604353. The next prime is 6442604407. The reversal of 6442604381 is 1834062446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6030920281 + 411684100 = 77659^2 + 20290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6442604381 is a prime.

It is a super-2 number, since 2×6442604381² = 83014302420160786322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6442604321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3221302190 + 3221302191.

It is an arithmetic number, because the mean of its divisors is an integer number (3221302191).

Almost surely, 2^6442604381 is an apocalyptic number.

It is an amenable number.

6442604381 is a deficient number, since it is larger than the sum of its proper divisors (1).

6442604381 is an equidigital number, since it uses as much as digits as its factorization.

6442604381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 38.

The square root of 6442604381 is about 80265.8357023709. The cubic root of 6442604381 is about 1860.7462590153.

The spelling of 6442604381 in words is "six billion, four hundred forty-two million, six hundred four thousand, three hundred eighty-one".